How do you prep a hollow metal door and frame for LCN machine screws?

To prep a hollow metal door and frame for LCN 1/4-20 machine screws you will first want to locate the proper location for mounting the closer and arm using the provided instruction sheets.

         After marking the hole locations, drill a pilot hole using a #7 drill bit, then use a 1/4-20 tap to create threads for the machine screws.


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